Lycoming Airworthiness Directives

Every AD in the library that names a Lycoming engine, gathered from its model pages.

110 not superseded, 14 of them with a repeat action. 135 listed in all, newest published August 28, 2026.

Published sinceHide 25 supersededOnly repeat actions110 of 135

2026-04-11Requires the actions in AD 2024-21-02 and expands the applicabilityEngineSupersedes 2024-21-02Repeat actionMar 4, 2026
2022-10-02Requires initial and repetitive special vibration tests of the engine and, depending on the results, replacement of either the reduction gearbox assembly or the engineEngine controls · EngineSupersedes 2002-03-01Repeat actionMay 24, 2022
2017-11-10Requires initial and repetitive inspections of engine exhaust system weld joints and torque checking the exhaust pipe flange mounting nutsEngine exhaust system · EngineRepeat actionJun 13, 2017
2015-19-07Lycoming Engines Fuel Injected Reciprocating EnginesEngineSupersedes 2011-26-04Repeat actionSep 29, 2015
2009-26-06Honeywell International Inc. ALF502 Series and LF507 Series Turbofan EnginesEngineSupersedes 97-11-05Repeat actionJan 7, 2010
2009-15-13Requires initial and repetitive visual inspections and initial and repetitive ultrasonic inspections of combustion chamber housings (CCHs) for cracksHoneywell International Inc., T5313 and T5317 Series Turboshaft Engines · EngineRepeat actionJul 21, 2009
2009-02-03Requires the same inspections, except if the plug is found loose, servo plug gasket, P/N 365533, must be replaced with a new, improved gasket, P/N 2577258Lycoming Engines IO, (L)IO, TIO, (L)TIO, AEIO, AIO, IGO, IVO, and HIO Series Reciprocating Engines, Teledyne Continental Motors (TCM) LTSIO-360-RB and TSIO-360-RB Reciprocating Engines, and Superior Air Parts, Inc. IO-360 Series Reciprocating Engines With Certain Precision Airmotive LLC RSA-5 and RSA-10 Series, and Bendix RSA-5 and RSA-10 Series, Fuel Injection Servos · EngineSupersedes 2008-08-14Repeat actionJan 23, 2009
2006-11-16Requires initial and repetitive visual and dimensional inspections of fuel control regulator assembly main and secondary drive shaft and pump gear splines, installed in certain fuel control regulator assembliesHoneywell International Inc. T5311A, T5311B, T5313B, T5317A, T5317A-1, and T5317B Series Turboshaft Engines and Lycoming Former Military T53-L-11B, T53-L-11D, T53-L-13B, T53-L-13B/D, and T53-L-703 Series Turboshaft Engines · EngineSupersedes 98-22-11Repeat actionMay 31, 2006
2006-09-13Requires removing those same parts from service using a drawdown scheduleHoneywell International Inc. ALF502L Series and ALF502R Series Turbofan Engines · EngineSupersedes 95-04-11Repeat actionMay 9, 2006
2002-22-06Honeywell International, Inc., (Formerly AlliedSignal, Inc. and Textron Lycoming) LF507 and ALF502R Series Turbofan EnginesEngineRepeat actionNov 1, 2002
2002-15-04Honeywell International, Inc., (formerly AlliedSignal, Inc. and Textron Lycoming) T5313B, T5317 Series, and T53 Series Turboshaft EnginesEngineRepeat actionAug 6, 2002
2002-12-07Textron Lycoming Reciprocating EnginesEngineSupersedes 2000-18-53Repeat actionJun 18, 2002
2002-09-09Honeywell International, Inc., (Formerly AlliedSignal, Inc., Textron Lycoming, Avco Lycoming, and Lycoming) Former Military T53 Series Turboshaft EnginesEngineRepeat actionMay 9, 2002
95-10-04AlliedSignal Inc. (Formerly Textron Lycoming and Avco Lycoming) Model T5313B and T5317 Series Turboshaft EnginesEngineSupersedes 86-09-05Repeat actionMay 10, 1995
2026-17-10Requires replacement of the affected piston pin with a part eligible for installation and, for certain engines, oil change and visual inspection of the engine oil filter, oil pressure screen, and oil suction screen...Lycoming Engines Engines · EngineAug 28, 2026
2023-09-09Requires repetitively inspecting the spot-welded, multi- segment exhaust tailpipe v-band couplingAerostar Aircraft Corporation, B-N Group Ltd., Commander Aircraft Corporation, Cirrus Design Corporation, Continental Aerospace Technologies Inc., Costruzioni Aeronautiche Tecnam S.P.A., Daher Aerospace, Diamond Aircraft Industries Inc, The Enstrom Helicopter Corporation, Helio Aircraft LLC, Helio Alaska Inc., The King's Engineering Fellowship, Lycoming Engines, Maule Aer · VariousJun 12, 2023
2022-16-03Requires the replacement of affected magneto or inspection of affected magneto and, if no white grease is detected, replacement of magneto components, as applicable, and reassembly of the magnetoEngineJul 29, 2022
2020-25-12Requires the removal from service of all affected crankshaft assembliesReciprocating engine power section · EngineDec 11, 2020
2017-16-11Requires an inspection of connecting rods and replacement of affected connecting rod small end bushingsReciprocating engine power section · EngineAug 10, 2017
2015-10-06Requires inspection of the engine exhaust pipes for cracks and replacement of the turbocharger mounting bracketLycoming Engines Reciprocating Engines (Type Certificate Previously Held by Textron Lycoming Division, AVCO Corporation) · EngineMay 28, 2015
2015-02-07Lycoming Engines Reciprocating Engines (Type Certificate previously held by Textron Lycoming Division, AVCO Corporation)EngineFeb 4, 2015
2013-21-02Requires removing certain HET turbochargers from service before further flightLycoming Engines and Continental Motors, Inc. Reciprocating Engines · EngineSupersedes 2012-24-09Oct 29, 2013
2012-19-01Lycoming Engines Reciprocating EnginesEngineSupersedes 2006-20-09Sep 19, 2012
2012-03-07Requires removing certain "machined-from-billet" Volare LLC (formerly Precision Airmotive Corporation, formerly Facet Aerospace Products Company, formerly Marvel-Schebler (BorgWarner)) HA-6 carburetors, inspecting...Lycoming Engines Reciprocating Engines · EngineFeb 21, 2012
2012-03-06Continental Motors, Lycoming Engines, Superior Air Parts, Inc. EnginesEngineSupersedes 2011-15-10Feb 9, 2012
71-13-01 R1Lycoming Engines EnginesEngineSupersedes 71-13-01Feb 2, 2012
2011-18-09Requires a crankshaft inspection for certain parts that may be installedLycoming Engines Model IO-720-A1B Reciprocating Engines · EngineSep 14, 2011
2011-13-03Requires inspecting certain Lycoming and TCM reciprocating engines with certain Hartzell Engine Technologies, LLC (HET) turbochargers installed, and disassembly and cleaning of the turbocharger center housing and...Lycoming Engines (Type Certificate Previously Held by Textron Lycoming) and Teledyne Continental Motors (TCM) Turbocharged Reciprocating Engines · EngineJun 28, 2011
2009-08-07Requires performing a dimensional inspection to determine if excessive disc balance material was removed and a magnetic particle inspection if the disc passes the dimensional inspectionHoneywell International Inc. ALF502L-2 and ALF502L-2C Turbofan Engines · EngineApr 13, 2009
2006-06-16Requires replacing certain crankshaftsLycoming Engines (Formerly Textron Lycoming) AEIO-360, IO-360, O-360, LIO-360, and LO-360 Series Reciprocating Engines · EngineMar 23, 2006
2006-01-05Requires implementing reduced life limits for certain parts, using cycle counting methods, and using draw- down schedules to replace components that exceed the new limitsHoneywell International Inc. (Formerly AlliedSignal, Inc., Formerly Textron Lycoming, Formerly Avco Lycoming) T5309, T5311, T5313B, T5317A, T5317A-1, and T5317B Series, and T53-L-9, T53-L-11, T53-L-13B, T53-L-13BA, T53-L-13B S/SA, T53-L-13B S/SB, T53-L-13B/D, and T53-L-703 Series Turboshaft Engines · EngineSupersedes 87-12-05Jan 12, 2006
2005-19-11Requires replacing certain crankshaftsLycoming Engines (Formerly Textron Lycoming) AEIO-360, IO-360, O-360, LIO-360, LO-360, AEIO-540, IO-540, O-540, and TIO-540 Series Reciprocating Engines · EngineSep 16, 2005
2004-10-14Requires the same actions but makes the correction that the existing gear retaining bolt and lockplate be removed from service and new hardware installed, and revises the definitions for sudden stoppage and propeller...Lycoming Engines (Formerly Textron Lycoming), Direct-Drive Reciprocating Engines · EngineSupersedes 91-14-22May 21, 2004
2004-05-24Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 Series Reciprocating EnginesEngineSupersedes 2002-23-06Mar 15, 2004
2003-14-03Textron Lycoming Fuel Injected Reciprocating EnginesEngineSupersedes 98-18-12Jul 10, 2003
2003-02-01Honeywell International, Inc., (formerly AlliedSignal, Inc. and Textron Lycoming) ALF502L-2, ALF502L-2C, ALF502R-3 and ALF502R-3A Series Turbofan EnginesEngineJan 15, 2003
2002-19-03Textron Lycoming IO-540, LTIO-540 and TIO-540 Series Reciprocating EnginesEngineSupersedes 2002-17-53, 2002-04-51Sep 20, 2002
2002-12-08Honeywell International, Inc. (formerly AlliedSignal Inc., and Textron Lycoming) ALF502 and LF507 Series Turbofan EnginesEngineJun 12, 2002
2002-03-09 R1Requires a one-time visual inspection for surface finish and a one-time fluorescent penetrant inspection for cracks of certain impellers installed on LTS101 series turboshaft and LTP101 series turboprop enginesHoneywell International Inc. (formerly AlliedSignal Inc. and Textron Lycoming) LTS101 Series Turboshaft and LTP101 Series Turboprop Engines · EngineSupersedes 2002-03-09Mar 21, 2002
99-15-06Requires incorporation of an improved fan core inlet anti-ice systemAlliedSignal Inc. (Formerly Textron Lycoming) Model ALF502R-5 and ALF502R-3A Turborfan Engines · EngineJul 19, 1999
99-04-04Textron Lycoming Reciprocating Engines IO-540 and O-540 Engines Equipped With Slick Aircraft Products MagnetosEngineFeb 10, 1999
99-03-05Textron Lycoming Model O-540-F1B5 Reciprocating EnginesEngineFeb 3, 1999
98-17-11Requires removal from service of affected crankshafts, or a visual inspection, magnetic particle inspection, and dimensional check of the crankshaft journals, and, if necessary, rework or removal from service of...Textron Lycoming and Teledyne Continental Motors Reciprocating Engines · EngineAug 20, 1998
97-21-07 R1AlliedSignal Inc. (Formerly Textron Lycoming) Model T5313B, T5317A, and T53 (Military) Turboshaft EnginesEngineJun 19, 1998
98-02-08Requires reporting findings of inspections to the FAACertain Textron Lycoming 320 and 360 Series Reciprocating Engines · EngineJan 28, 1998
97-21-07AlliedSignal Inc. (Formerly Textron Lycoming) Model T5313B, T5317A, and T53 (Military) Turboshaft EnginesEngineOct 17, 1997
97-15-11Avco Lycoming and Textron Lycoming Reciprocating EnginesEngineSupersedes 97-01-03Jul 28, 1997
96-12-27Requires removal from service of suspect disks for a one-time inspection of the disk tenon area of the gas generator turbine diskAlliedSignal Inc. (formerly Textron Lycoming) LTS 101 Series Turboshaft and LTP 101 Series Turboprop Engines · EngineJun 19, 1996
96-09-10Lycoming Engines EnginesEngineSupersedes 81-18-04 R2Jun 10, 1996
91-21-01 R1Textron Lycoming Model TIO-540-S1AD Reciprocating EnginesEngineJun 7, 1996
95-26-01Requires installation of an improved power turbine (PT) rotor and electronic PT rotor overspeed controller as a terminating action to the currently required inspections of AD 88-14-01AlliedSignal, Inc. (formerly Textron Lycoming) Models LTS101-650B1, -750B1, -650C, and -750C Turboshaft Engines · EngineFeb 22, 1996
95-26-02Lycoming Engines, Textron Lycoming, AVCO Corporation EnginesEngineJan 9, 1996
95-03-10Requires a one-time inspection within the next 5 hours time in service to determine the part number (P/N) and revision letter of the push rod installed on the engineLycoming Engines Engines · EngineJan 9, 1996
95-07-01Requires removal prior to further flight of suspect unapproved connecting rod bolts and replacement with serviceable connecting rod boltsLycoming Engines, Textron Lycoming, AVCO Corporation Engines · EngineMar 28, 1995
93-14-15Lycoming Engines EnginesEngineAug 23, 1993
92-12-05Lycoming Engines, Textron Lycoming, AVCO Corporation EnginesEngineJul 10, 1992
90-04-06 R1Lycoming Engines, Textron Lycoming, AVCO Corporation EnginesEngineMay 28, 1991
91-10-04Lycoming Engines EnginesEngineMay 21, 1991
91-08-07Lycoming Engines EnginesEngineMay 6, 1991
89-15-10Lycoming Engines EnginesEngineNov 30, 1989
89-13-02Lycoming Engines EnginesEngineNov 30, 1989
87-10-06 R1Lycoming Engines EnginesEngineSep 1, 1989
80-04-03 R2Lycoming Engines EnginesEngineApr 25, 1988
84-19-03 R1Lycoming Engines EnginesEngineSep 20, 1984
84-13-05Lycoming Engines EnginesEngineJul 16, 1984
83-22-04Lycoming Engines EnginesEngineNov 4, 1983
81-03-05Lycoming Engines EnginesEngineFeb 11, 1981
80-25-02 R2Lycoming Engines EnginesEngineJan 13, 1981
80-17-10Lycoming Engines EnginesEngineAug 18, 1980
80-04-04 R1Lycoming Engines EnginesEngineAug 18, 1980
80-14-07Lycoming Engines EnginesEngineJul 7, 1980
79-10-03 R2Lycoming Engines EnginesEngineJul 1, 1980
80-02-13Lycoming Engines EnginesEngineJan 22, 1980
79-04-05Lycoming Engines, Textron Lycoming, AVCO Corporation EnginesEngineSep 26, 1979
79-15-02Lycoming Engines EnginesEngineJul 20, 1979
78-12-09Lycoming Engines EnginesEngineFeb 20, 1979
77-07-07Lycoming Engines EnginesEngineFeb 20, 1979
78-25-01Lycoming Engines EnginesEngineDec 8, 1978
78-23-10Lycoming Engines, Textron Lycoming, AVCO Corporation EnginesEngineNov 7, 1978
78-23-08Lycoming Engines EnginesEngineNov 7, 1978
77-20-07Lycoming Engines EnginesEngineAug 31, 1978
78-12-08Lycoming Engines EnginesEngineJun 20, 1978
75-08-09Lycoming Engines EnginesEngineAug 18, 1977
73-23-01Lycoming Engines, Textron Lycoming, AVCO Corporation EnginesEngineJan 13, 1977
75-09-15Lycoming Engines, Textron Lycoming, AVCO Corporation EnginesEngineApr 30, 1975
73-05-01Lycoming Engines EnginesEngineJul 9, 1974
74-13-05Lycoming Engines EnginesEngineJun 21, 1974
73-15-04Lycoming Engines EnginesEngineJul 23, 1973
71-05-02Lycoming Engines EnginesEngineFeb 13, 1973
72-21-06Lycoming Engines EnginesEngineOct 17, 1972
72-21-04Lycoming Engines EnginesEngineOct 13, 1972
71-11-02Lycoming Engines EnginesEngineMar 14, 1972
69-25-08Lycoming Engines EnginesEngineFeb 19, 1970
69-08-09Lycoming Engines EnginesEngineApr 23, 1969
66-06-03Lycoming Engines, Textron Lycoming, AVCO Corporation EnginesEngineJan 16, 1969
63-23-02Lycoming Engines EnginesEngineAug 6, 1968
68-08-08Lycoming Engines EnginesEngineMay 19, 1968
67-22-06Lycoming Engines EnginesEngineAug 9, 1967
65-03-03Lycoming Engines EnginesEngineAug 5, 1967
66-20-04Lycoming Engines EnginesEngineAug 27, 1966
66-14-03Lycoming Engines EnginesEngineJul 9, 1966
64-16-05Lycoming Engines EnginesEngineJul 10, 1964
63-14-03Lycoming Engines EnginesEngineJul 6, 1963
62-23-05Lycoming Engines EnginesEngineNov 14, 1962
62-03-02Lycoming Engines EnginesEngineFeb 27, 1962
60-11-06Lycoming Engines EnginesEngine1960
59-10-07Lycoming Engines EnginesEngine1959
55-02-02Lycoming Engines EnginesEngine1955
54-02-01Textron Lycoming, AVCO Corporation EnginesEngine1954
51-24-01Lycoming Engines EnginesEngine1951

Listed by the model designations in each AD's text. An AD written for a part number, or for "all" engines of a maker, may name no model and so not appear here: search the library for the part or the maker as well.